I. REPRODUCTION AND LAMB PRODUCTION Relationships among hemoglobin (Hb) genotypes and reproduction and production traits were examined in 294 four- and five-year-old North Country Cheviot, Dorset, Finnsheep or Romney x Suffolk or Columbia-type crossbred ewes. Hb BB ewe lambs were youngest at first estrus and Hb AA ewe lambs were...
One thousand twenty-three lambing records of 351 ewes bred in a
rotational crossbreeding system involving Columbia or Targhee,
Hampshire and Finnish Landrace breeds were examined. A regression
approach was used to determine the effects of breeds and heterosis on
wool grade, greasy fleece weight, ewe weight at lambing, lambing date,...